2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
24 #include "gstrtpL16enc.h"
26 /* elementfactory information */
27 static GstElementDetails gst_rtpL16enc_details = {
28 "RTP RAW Audio Encoder",
29 "Codec/Encoder/Network",
30 "Encodes Raw Audio into an RTP packet",
31 "Zeeshan Ali <zak147@yahoo.com>"
34 /* RtpL16Enc signals and args */
47 static GstStaticPadTemplate gst_rtpL16enc_sink_template =
48 GST_STATIC_PAD_TEMPLATE ("sink",
51 GST_STATIC_CAPS ("audio/x-raw-int, "
52 "endianness = (int) BYTE_ORDER, "
53 "signed = (boolean) true, "
56 "rate = (int) [ 1000, 48000 ], " "channels = (int) [ 1, 2 ]")
59 static GstStaticPadTemplate gst_rtpL16enc_src_template =
60 GST_STATIC_PAD_TEMPLATE ("src",
63 GST_STATIC_CAPS ("application/x-rtp")
66 static void gst_rtpL16enc_class_init (GstRtpL16EncClass * klass);
67 static void gst_rtpL16enc_base_init (GstRtpL16EncClass * klass);
68 static void gst_rtpL16enc_init (GstRtpL16Enc * rtpL16enc);
69 static void gst_rtpL16enc_chain (GstPad * pad, GstData * _data);
70 static void gst_rtpL16enc_set_property (GObject * object, guint prop_id,
71 const GValue * value, GParamSpec * pspec);
72 static void gst_rtpL16enc_get_property (GObject * object, guint prop_id,
73 GValue * value, GParamSpec * pspec);
74 static GstPadLinkReturn gst_rtpL16enc_sinkconnect (GstPad * pad,
75 const GstCaps * caps);
76 static GstElementStateReturn gst_rtpL16enc_change_state (GstElement * element);
78 static GstElementClass *parent_class = NULL;
81 gst_rtpL16enc_get_type (void)
83 static GType rtpL16enc_type = 0;
85 if (!rtpL16enc_type) {
86 static const GTypeInfo rtpL16enc_info = {
87 sizeof (GstRtpL16EncClass),
88 (GBaseInitFunc) gst_rtpL16enc_base_init,
90 (GClassInitFunc) gst_rtpL16enc_class_init,
93 sizeof (GstRtpL16Enc),
95 (GInstanceInitFunc) gst_rtpL16enc_init,
99 g_type_register_static (GST_TYPE_ELEMENT, "GstRtpL16Enc",
102 return rtpL16enc_type;
106 gst_rtpL16enc_base_init (GstRtpL16EncClass * klass)
108 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
110 gst_element_class_add_pad_template (element_class,
111 gst_static_pad_template_get (&gst_rtpL16enc_sink_template));
112 gst_element_class_add_pad_template (element_class,
113 gst_static_pad_template_get (&gst_rtpL16enc_src_template));
114 gst_element_class_set_details (element_class, &gst_rtpL16enc_details);
118 gst_rtpL16enc_class_init (GstRtpL16EncClass * klass)
120 GObjectClass *gobject_class;
121 GstElementClass *gstelement_class;
123 gobject_class = (GObjectClass *) klass;
124 gstelement_class = (GstElementClass *) klass;
126 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
128 gobject_class->set_property = gst_rtpL16enc_set_property;
129 gobject_class->get_property = gst_rtpL16enc_get_property;
131 gstelement_class->change_state = gst_rtpL16enc_change_state;
135 gst_rtpL16enc_init (GstRtpL16Enc * rtpL16enc)
138 gst_pad_new_from_template (gst_static_pad_template_get
139 (&gst_rtpL16enc_sink_template), "sink");
141 gst_pad_new_from_template (gst_static_pad_template_get
142 (&gst_rtpL16enc_src_template), "src");
143 gst_element_add_pad (GST_ELEMENT (rtpL16enc), rtpL16enc->sinkpad);
144 gst_element_add_pad (GST_ELEMENT (rtpL16enc), rtpL16enc->srcpad);
145 gst_pad_set_chain_function (rtpL16enc->sinkpad, gst_rtpL16enc_chain);
146 gst_pad_set_link_function (rtpL16enc->sinkpad, gst_rtpL16enc_sinkconnect);
148 rtpL16enc->frequency = 44100;
149 rtpL16enc->channels = 2;
151 rtpL16enc->next_time = 0;
152 rtpL16enc->time_interval = 0;
155 rtpL16enc->ssrc = random ();
158 static GstPadLinkReturn
159 gst_rtpL16enc_sinkconnect (GstPad * pad, const GstCaps * caps)
161 GstRtpL16Enc *rtpL16enc;
162 GstStructure *structure;
165 rtpL16enc = GST_RTP_L16_ENC (gst_pad_get_parent (pad));
167 structure = gst_caps_get_structure (caps, 0);
169 ret = gst_structure_get_int (structure, "rate", &rtpL16enc->frequency);
170 ret &= gst_structure_get_int (structure, "channels", &rtpL16enc->channels);
173 return GST_PAD_LINK_REFUSED;
175 /* Pre-calculate what we can */
176 rtpL16enc->time_interval =
177 GST_SECOND / (2 * rtpL16enc->channels * rtpL16enc->frequency);
179 return GST_PAD_LINK_OK;
184 gst_rtpL16enc_htons (GstBuffer * buf)
188 /* FIXME: is this code correct or even sane at all? */
189 i = (gint16 *) GST_BUFFER_DATA (buf);
190 len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
192 for (; i < len; i++) {
198 gst_rtpL16enc_chain (GstPad * pad, GstData * _data)
200 GstBuffer *buf = GST_BUFFER (_data);
201 GstRtpL16Enc *rtpL16enc;
205 g_return_if_fail (pad != NULL);
206 g_return_if_fail (GST_IS_PAD (pad));
207 g_return_if_fail (buf != NULL);
209 rtpL16enc = GST_RTP_L16_ENC (GST_OBJECT_PARENT (pad));
211 g_return_if_fail (rtpL16enc != NULL);
212 g_return_if_fail (GST_IS_RTP_L16_ENC (rtpL16enc));
214 if (GST_IS_EVENT (buf)) {
215 GstEvent *event = GST_EVENT (buf);
217 switch (GST_EVENT_TYPE (event)) {
218 case GST_EVENT_DISCONTINUOUS:
219 GST_DEBUG ("discont");
220 rtpL16enc->next_time = 0;
221 gst_pad_event_default (pad, event);
224 gst_pad_event_default (pad, event);
229 /* We only need the header */
230 packet = rtp_packet_new_allocate (0, 0, 0);
232 rtp_packet_set_csrc_count (packet, 0);
233 rtp_packet_set_extension (packet, 0);
234 rtp_packet_set_padding (packet, 0);
235 rtp_packet_set_version (packet, RTP_VERSION);
236 rtp_packet_set_marker (packet, 0);
237 rtp_packet_set_ssrc (packet, g_htonl (rtpL16enc->ssrc));
238 rtp_packet_set_seq (packet, g_htons (rtpL16enc->seq));
239 rtp_packet_set_timestamp (packet,
240 g_htonl ((guint32) rtpL16enc->next_time / GST_SECOND));
242 if (rtpL16enc->channels == 1) {
243 rtp_packet_set_payload_type (packet, (guint8) PAYLOAD_L16_MONO);
247 rtp_packet_set_payload_type (packet, (guint8) PAYLOAD_L16_STEREO);
250 /* FIXME: According to RFC 1890, this is required, right? */
251 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
252 gst_rtpL16enc_htons (buf);
255 outbuf = gst_buffer_new ();
256 GST_BUFFER_SIZE (outbuf) =
257 rtp_packet_get_packet_len (packet) + GST_BUFFER_SIZE (buf);
258 GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
259 GST_BUFFER_TIMESTAMP (outbuf) = rtpL16enc->next_time;
261 memcpy (GST_BUFFER_DATA (outbuf), packet->data,
262 rtp_packet_get_packet_len (packet));
263 memcpy (GST_BUFFER_DATA (outbuf) + rtp_packet_get_packet_len (packet),
264 GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
266 GST_DEBUG ("gst_rtpL16enc_chain: pushing buffer of size %d",
267 GST_BUFFER_SIZE (outbuf));
268 gst_pad_push (rtpL16enc->srcpad, GST_DATA (outbuf));
271 rtpL16enc->next_time += rtpL16enc->time_interval * GST_BUFFER_SIZE (buf);
273 rtp_packet_free (packet);
274 gst_buffer_unref (buf);
278 gst_rtpL16enc_set_property (GObject * object, guint prop_id,
279 const GValue * value, GParamSpec * pspec)
281 GstRtpL16Enc *rtpL16enc;
283 /* it's not null if we got it, but it might not be ours */
284 g_return_if_fail (GST_IS_RTP_L16_ENC (object));
285 rtpL16enc = GST_RTP_L16_ENC (object);
294 gst_rtpL16enc_get_property (GObject * object, guint prop_id, GValue * value,
297 GstRtpL16Enc *rtpL16enc;
299 /* it's not null if we got it, but it might not be ours */
300 g_return_if_fail (GST_IS_RTP_L16_ENC (object));
301 rtpL16enc = GST_RTP_L16_ENC (object);
305 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
310 static GstElementStateReturn
311 gst_rtpL16enc_change_state (GstElement * element)
313 GstRtpL16Enc *rtpL16enc;
315 g_return_val_if_fail (GST_IS_RTP_L16_ENC (element), GST_STATE_FAILURE);
317 rtpL16enc = GST_RTP_L16_ENC (element);
319 GST_DEBUG ("state pending %d\n", GST_STATE_PENDING (element));
321 /* if going down into NULL state, close the file if it's open */
322 switch (GST_STATE_TRANSITION (element)) {
323 case GST_STATE_NULL_TO_READY:
326 case GST_STATE_READY_TO_NULL:
333 /* if we haven't failed already, give the parent class a chance to ;-) */
334 if (GST_ELEMENT_CLASS (parent_class)->change_state)
335 return GST_ELEMENT_CLASS (parent_class)->change_state (element);
337 return GST_STATE_SUCCESS;
341 gst_rtpL16enc_plugin_init (GstPlugin * plugin)
343 return gst_element_register (plugin, "rtpL16enc",
344 GST_RANK_NONE, GST_TYPE_RTP_L16_ENC);